protues波形显示器

仿真原理图如下(proteus仿真工程文件可到本帖附件中下载)

DAC0832

单片机源程序如下:

#include

sbit wr=P3^6;

sbit rd=P3^2;

sbit key0=P1^0;

sbit key1=P1^1;

sbit key2=P1^2;

sbit key3=P1^3;

sbit key4=P1^4;

unsigned char flag;

unsigned char const code

SIN_code[256]={0x80,0x83,0x86,0x89,0x8c,0x8f,0x92,0x95,0x98,0x9c,0x9f,0xa2,0xa5,0xa8,0xab,0xae,

0xb0,0xb3,0xb6,0xb9,0xbc,0xbf,0xc1,0xc4,0xc7,0xc9,0xcc,0xce,0xd1,0xd3,0xd5,0xd8,0xda,0xdc,0xde,

0xe0,0xe2,0xe4,0xe6,0xe8,0xea,0xec,0xed,0xef,0xf0,0xf2,0xf3,0xf4,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,

0xfc,0xfc,0xfd,0xfe,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xfe,0xfe,0xfd,

0xfc,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5,0xf3,0xf2,0xf0,0xef,0xed,0xec,0xea,0xe8,0xe6,0xe4,

0xe3,0xe1,0xde,0xdc,0xda,0xd8,0xd6,0xd3,0xd1,0xce,0xcc,0xc9,0xc7,0xc4,0xc1,0xbf,0xbc,0xb9,0xb6,

0xb4,0xb1,0xae,0xab,0xa8,0xa5,0xa2,0x9f,0x9c,0x99,0x96,0x92,0x8f,0x8c,0x89,0x86,0x83,0x80,0x7d,

0x79,0x76,0x73,0x70,0x6d,0x6a,0x67,0x64,0x61,0x5e,0x5b,0x58,0x55,0x52,0x4f,0x4c,0x49,0x46,0x43,

0x41,0x3e,0x3b,0x39,0x36,0x33,0x31,0x2e,0x2c,0x2a,0x27,0x25,0x23,0x21,0x1f,0x1d,0x1b,0x19,0x17,

0x15,0x14,0x12,0x10,0xf,0xd,0xc,0xb,0x9,0x8,0x7,0x6,0x5,0x4,0x3,0x3,0x2,0x1,0x1,0x0,0x0,0x0,0x0,

0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0x1,0x2,0x3,0x3,0x4,0x5,0x6,0x7,0x8,0x9,0xa,0xc,0xd,0xe,0x10,0x12,

0x13,0x15,0x17,0x18,0x1a,0x1c,0x1e,0x20,0x23,0x25,0x27,0x29,0x2c,0x2e,0x30,0x33,0x35,0x38,0x3b,

0x3d,0x40,0x43,0x46,0x48,0x4b,0x4e,0x51,0x54,0x57,0x5a,0x5d,0x60,0x63,0x66,0x69,0x6c,0x6f,0x73,

0x76,0x79,0x7c};

unsigned char keyscan()

{

unsigned char keyscan_num,temp;

P1=0xff;

temp=P1;

if(~(temp&0xff))

{

if(key0==0)

{

keyscan_num=1;

}

else if(key1==0)

{

keyscan_num=2;

}

else if(key2==0)

{

keyscan_num=3;

}

else if(key3==0)

{

keyscan_num=4;

}

else if(key4==0)

{

keyscan_num=5;

}

else

{

keyscan_num=0;

}

return keyscan_num;

}

}

void init_DA0832()

{

rd=0;

wr=0;

}

void SIN()

{

unsigned int i;

do{

P2=SIN_code[i];

i=i+1;

}while(i<256);

}

void Square()

{

EA=1;

ET0=1;

TMOD=1;

TH0=0xff;

TL0=0x83;

TR0=1;

}

void Triangle()

{

P2=0x00;

do{

P2=P2+1;

}while(P2<0xff);

P2=0xff;

do{

P2=P2-1;

}while(P2>0x00);

P2=0x00;

}

void Sawtooth()

{

P2=0x00;

do{

P2=P2+1;

}while(P2<0xff);

}

void Trapezoidal()

{

unsigned char i;

P2=0x00;

do{

P2=P2+1;

}while(P2<0xff);

P2=0xff;

for(i=255;i>0;i--)

{

P2=0xff;

}

do{

P2=P2-1;

}while(P2>0x00);

P2=0X00;

}

void main()

{

init_DA0832();

do

{

flag=keyscan();

}while(!flag);

while(1)

{

switch(flag)

{

case 1:

do{

flag=keyscan();

SIN();

}while(flag==1);

break;

case 2:

Square();

do{

flag=keyscan();

}while(flag==2);

TR0=0;

break;

case 3:

do{

flag=keyscan();

Triangle();

}while(flag==3);

break;

case 4:

do{

flag=keyscan();

Trapezoidal();

}while(flag==4);

break;

case 5:

do{

flag=keyscan();

Sawtooth();

}while(flag==5);

break;

default:

flag=keyscan();

break;

}

}

}

void timer0(void) interrupt 1

{

P2=~P2;

TH0=0xff;

TL0=0x83;

TR0=1;

}